作者:Alex W. Gregory、Alan Chambers、Alison Hawkins、Pavol Jakubec、Darren J. Dixon
DOI:10.1002/chem.201405256
日期:2015.1.2
A new chemoselective reductive nitro‐Mannich cyclization reaction sequence of nitroalkyl‐tethered lactams has been developed. Relying on the rapid and chemoselective iridium(I)‐catalyzed reduction of lactams to the corresponding enamine, subsequent nitro‐Mannich cyclization of tethered nitroalkyl functionality provides direct access to important alkaloid natural‐product‐like structures in yields up
In connection with the development of new potential 5-HT1A ligands, multistep synthesis of N-substituted-3-aminomethyl-2,3-dihydro-1,4-dioxinol[2,3-b]pyridine derivatives as ORG13514 analogs are described. Their biological activity as 5-HT1A type ligands is reported and compared with ORG13514 affinity and selectivity for 5-HT1A receptors. (C) 1999 Elsevier Science S.A. All rights reserved.
Iridium-Catalyzed Aza-Spirocyclization of Indole-Tethered Amides: An Interrupted Pictet–Spengler Reaction
作者:Pablo Gabriel、Alex W. Gregory、Darren J. Dixon
DOI:10.1021/acs.orglett.9b02194
日期:2019.9.6
A mild, reductive spirocyclization of indole-linked amides and lactams for the efficient and selective synthesis of aza-spirocyclic indoline products is described. The catalytic reductive activation of tertiary amides or lactams by Vaska's complex with tetramethyldisiloxane as the terminal reductant allowed iminium ion formation, before a diastereoselective 5-endo-trig spirocyclization of the tethered